NEW YORK — Maybe it’s the weather.

A brutal New York City winter has extended into spring, preventing the Mets from producing runs. Maybe it was the biting cold that tweaked the hamstring of Clay Holmes on Friday night.

Since returning home to Citi Field this week, the Mets’ offense has gone from an overflow to a dripping faucet. It shut off completely Friday night in a 4-0 loss to the A’s. In four games this week, the Mets have gone 1-3 and scored only seven runs.

Even worse, they lost Holmes to left hamstring tightness 5 1/3 innings into his outing against the A’s. He came out of the game with one out and one on in the sixth, and the Mets trailing 1-0. Holmes allowed only one earned run on five hits, working around traffic created by a pesky A’s lineup. The right-hander struck out three and walked three, with a walk hurting him in the third inning.

Carlos Cortes singled to left to start the inning, and Holmes then struck out Denzel Clarke to turn over the lineup. He had leadoff hitter Lawrence Butler on a full count before missing well inside with a cutter for ball 4, putting runners on first and second. Nick Kurtz hit a ground ball to second baseman Marcus Semien that should have been a double play, but shortstop Francisco Lindor was unable to complete it, and Cortes went to third.

He then scored easily on a single by Shea Langeliers.

Meanwhile, right-hander J.T. Ginn blanked the Mets for four innings, giving up only one hit — a bunt single by Jared Young that rolled down the line and barely stayed fair. Drafted by the Mets in 2020, Ginn was sent west to Oakland in the Chris Bassitt trade in 2022. He struck out four and walked one.

The Mets’ best chance to tie came in the sixth inning when right-hander Jack Perkins relieved righty Mark Leiter Jr. They put runners on the corners with no outs after back-to-back singles by Francisco Lindor and Bo Bichette. But a ground ball by Young turned into a fielder’s choice out.

Kurtz, the first baseman, faked a throw home and turned toward third. Lindor turned back to slide into third and beat the throw, but it was too late. Luis Robert Jr. then grounded into a double play.

The threat was erased.

After Holmes left the game, right-hander Tobias Myers came in and sat down the first eight hitters he faced before falling apart in the top of the ninth. Carson Benge bobbled a ball in left field, turning a leadoff single into a double for Jacob Wilson, and former Mets utilityman Jeff McNeil sent him home with a single.

Benge’s throw home was way off target, and the team from Sacramento went up 2-1, then 3-1 with a double by Max Muncy and a one-out single by Clarke.

The fans let the Mets hear it.

Earlier in the day, president of baseball operations David Stearns said he was pleased with the way the Mets were finding different ways to win. But in their third straight loss, they found different ways to lose.

Warm weather is on the horizon, but unfortunately, it’s in Los Angeles with the two-time defending World Series champion Dodgers. The Mets have two more games at home this weekend to get hot before traveling back to California to face the team that remains a perennial thorn in their side.

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